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Summary of significant accounting policies - Nonperforming assets (Details)	12 Months Ended
	Dec. 31, 2024
Summary of significant accounting policies
Non performing loans past due period for Non-accrual status	90 days
Minimum contractual terms of a loan	6 months

X

- Definition

The number of days past due for nonperforming loans which include nonaccrual loans and troubled debt restructured loans.

+ References

No definition available.

+ Details

Name:	pfis_FinanceReceivablePastDuePeriodForNonaccrualStatus
Namespace Prefix:	pfis_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The minimum contractual terms of a loan.

+ References

No definition available.

+ Details

Name:	pfis_MinimumContractualTermPeriod
Namespace Prefix:	pfis_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration